What do you like the most about redstone?: The potential of creating a programmable computer

What's a thing you have made which demonstrates redstone knowledge?: A 4 bit ALU, a 4 bit RAM address, and a 1:1 block to pixel display

What does the thing do?: The ALU takes two 4 bit inputs and allows the user to perform a number of operations including logical operations along with addition and subtraction. The RAM address can store any binary value from 0 to 15 and possesses read and write enable lines to control the flow of information. The 1:1 block to pixel display allows for compact pixel displays by being infinitely stackable and only 11 blocks long